Download or read book UV Absorption Measurements of Nitric Oxide Compared to Probe Sampling Data for Measurements in a Turbine Engine Exhaust at Simulated Altitude Conditions written by R. Howard and published by . This book was released on 1997 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitric oxide measurements were conducted in the exhaust of a turbofan engine at simulated altitude conditions in a ground-level test cell using both optical nonintrusive and conventional gas sampling techniques. NO-UV absorption measurements, using both resonance and continuum lamps, were made through several chords of the exhaust flow near the nozzle exit plane as a part of a larger effort to characterize aircraft exhaust constituents over a wide range of steady-state engine operating conditions. This paper describes the NO-UV absorption measurements and compares radial profiles of NO concentrations and emission indices with measurements obtained using conventional gas sampling and tunable diode laser infrared absorption.

Download or read book Comparison of UV Absorption Measurements with Probe Sampling Measurements of Nitric Oxide Concentration in a Jet Engine Combustor Exhaust written by J. D. Few and published by . This book was released on 1976 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements were made in the exhaust of a T-56 turbine engine combustor of nitric oxide (NO) concentration using an ultraviolet (UV) spectral absorption technique. The measurements were made at two axial locations in the combustor exhaust stream. The NO gamma-band radiation at 2265 A produced in a resonance source was passed through the exhaust stream, and the amount transmitted was recorded. The mathematical model used to determine the NO concentration from the absorption measurements is described. Pressure and temperature broadening effects on the measured absorption are considered in the line-by-line transmission calculation. The line-of-sight absorption measurements through the axisymmetric exhaust stream were converted to local concentration values via an iterative radial inversion computation. These in situ measurements are compared to NO concentration values obtained by conventional probe-sampling techniques using a chemiluminescent analyzer. The in situ measurements of the NO concentration were larger than the probe-sampled measurements by from 50 to 80 percent, depending upon the measurement location in the exhaust stream. (Author).

Download or read book Advanced Non intrusive Instrumentation for Propulsion Engines written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium and published by North Atlantic Treaty Organization Resear Rganization. This book was released on 1998 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AGARD Index of Publications written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1995 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1977 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Probe Sampling Versus Optical in Situ Measurements of Nitric Oxide Concentrations in a Jet Engine Combustor Exhaust written by J. D. Few and published by . This book was released on 1977 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of nitric oxide (NO) concentrations were made at the exhaust of a jet engine combustor by conventional gas-sampling probe and chemiluminescent analyzer methods, by optical resonance absorption through absorption cells located within the gas sample transfer line, and by optical resonance absorption directly through the combustor exhaust. The combustor was exhausted to atmospheric pressure and was operated at an inlet temperature near 600F, a total pressure of about 3 to 4 atm, and at fuel-to-air ratios (f/a) from 0.01 to 0.05. A tubular inlet, liquid-cooled, stainless steel sampling probe was inserted into the gas stream at the combustor exit. The optical technique used was the resonance absorption method for the (0,0) gamma-band of NO at wavelengths ranging from 2,200 to 2,270 A. The results showed that within the sampling line both the chemiluminescent gas analyzer and the optical absorption method gave NO concentrations that agreed within about 20 percent.

Download or read book Toxicology Research Projects Directory written by and published by . This book was released on 1978 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reevaluation of Nitric Oxide Concentration in Exhaust of Jet Engines and Combustors written by J. D. Few and published by . This book was released on 1981 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several measurements of nitric oxide (NO) concentrations in the exhaust of jet engines and combustors by probe sampling and ultraviolet (UV) resonance absorption have been reported. Generally, the optically determined concentrations have exceeded the probe determined values appreciably. The theoretical basis for the determination of the NO concentration from absorption measurements has recently been reexamined, and the values previously reported were redetermined. Upon reexamination, the parameter a (the ratio of collisional plus natural half-width to the Doppler half-width) was found to obey the relationship a = C P/T sub 0 to the 1.5 power where P is the pressure in atmospheres, T is the temperature in K, and C is a constant. The value of C was found to be 3.81 (+ or - 40) x 10,000 k to the 1.5 power/atm. The major conclusion of previous studies remains unchanged, namely, that optically determined NO concentrations may be a factor of 5 larger than probe determined values or may be the same, depending on the combustion gas flow conditions and/or probe design. However, certain optically determined NO concentrations varied by as much as 46 percent from previously reported values because of alternations made to the theory and parameters.

Download or read book Optical in Situ Versus Probe Measurements of Nitric Oxide Concentration as a Function of Axial Position in a Combustor Exhaust written by J. D. Few and published by . This book was released on 1979 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitric oxide (N0) concentration was measured at three axial stations (6.5, 12, and 25 nozzle diameters downstream of a combustor nozzle exit) in a jet engine combustor exhaust by a gas-sampling probe in conjunction with conventional gas analyzers and an optical resonance absorption technique. The gas analyzer system permitted measurements of NO, NO sub x, CO, CO sub 2, and C sub x, H sub y (total hydrocarbons) whereas the optical absorption technique permitted measurement of NO only. The combustor was exhausted into a test cell of slightly less than atmospheric pressure and was operated at an inlet air temperature of 589 K, a total pressure of 344.3 kPa, and a fuel-to-air ratio (f/a) of 0.02. A multiprobe rake was used to acquire emissions, total pressure and temperature, and static pressure data at the measurement stations. The measurements of total pressure, total temperature, and measured static pressure were used to determine static temperature and pressure profiles at each measurement station, which are required for determining NO concentration by the optical absorption technique.

Download or read book A Collection of Technical Papers written by and published by . This book was released on 1973 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nitric Oxide Measurement Study written by and published by . This book was released on 1981 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1979 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1978 with total page 1122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Pollution Control written by and published by . This book was released on with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nitric Oxide Measurement Study written by and published by . This book was released on 1980 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nitric Oxide Measurement Study written by and published by . This book was released on 1981 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of UV Optical Measurements of Nitric Oxide and Hydroxyl Radical at the Exit of High Pressure Gas Turbine Combustors written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of nitric oxide (NO) and hydroxyl radical (OR) have been made in a laboratory flat flame at pressures up to 30 atm using line-of-sight resonant absorption. Data are reported at equivalence ratios of 0.98 and 1.3 and pressures of 1, 5, 10, 20 and 30 atm. The performance of the in-situ LTV absorption technique with assessed at these elevated pressures by comparing the measured absorption with those predicted by detailed theoretical spectroscopic models for NO and OH. Previous to this experiment the resonant models had not been verified at pressures greater than two atmospheres. Agreement within 25% was found between the measurements and predictions with only slight modification of the existing models for both NO and OH to account for line center shifting and pressure broadening. Continuum interference of hot oxygen (O2) on the NO absorption spectra was not significant in the interpretation of the data. The optical methods used in this study are distinct from laser-based diagnostics such as laser induced fluorescence and, hence, have the potential to provide independent verification of the laser-based measurements. The methodology is also of sufficient simplicity to be hardened into a portable optical measurement system that can be deployed in gas turbine engine test cells. A miniature fiber optic couple portable instrument is described. Liscinsky, D. S. and Knight, B. A. and Shirley, J. A. Glenn Research Center NAS3-27593; RTOP 538-08-12...